California Code, Penal Code - PEN § 11165.4

As used in this article, “unlawful corporal punishment or injury” means a situation where any person willfully inflicts upon any child any cruel or inhuman corporal punishment or injury resulting in a traumatic condition. It does not include an amount of force that is reasonable and necessary for a person employed by or engaged in a public school to quell a disturbance threatening physical injury to person or damage to property, for purposes of self-defense, or to obtain possession of weapons or other dangerous objects within the control of the pupil, as authorized by Section 49001 of the Education Code. It also does not include the exercise of the degree of physical control authorized by Section 44807 of the Education Code. It also does not include an injury caused by reasonable and necessary force used by a peace officer acting within the course and scope of his or her employment as a peace officer.